Commit | Line | Data |
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1cd2224c MR |
1 | /* |
2 | * Digital Beep Input Interface for HD-audio codec | |
3 | * | |
4 | * Author: Matthew Ranostay <mranostay@embeddedalley.com> | |
5 | * Copyright (c) 2008 Embedded Alley Solutions Inc | |
6 | * | |
7 | * This driver is free software; you can redistribute it and/or modify | |
8 | * it under the terms of the GNU General Public License as published by | |
9 | * the Free Software Foundation; either version 2 of the License, or | |
10 | * (at your option) any later version. | |
11 | * | |
12 | * This driver is distributed in the hope that it will be useful, | |
13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | * GNU General Public License for more details. | |
16 | * | |
17 | * You should have received a copy of the GNU General Public License | |
18 | * along with this program; if not, write to the Free Software | |
19 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
20 | */ | |
21 | ||
22 | #include <linux/input.h> | |
23 | #include <linux/pci.h> | |
5a0e3ad6 | 24 | #include <linux/slab.h> |
1cd2224c MR |
25 | #include <linux/workqueue.h> |
26 | #include <sound/core.h> | |
27 | #include "hda_beep.h" | |
b7b51141 | 28 | #include "hda_local.h" |
1cd2224c MR |
29 | |
30 | enum { | |
31 | DIGBEEP_HZ_STEP = 46875, /* 46.875 Hz */ | |
32 | DIGBEEP_HZ_MIN = 93750, /* 93.750 Hz */ | |
33 | DIGBEEP_HZ_MAX = 12000000, /* 12 KHz */ | |
34 | }; | |
35 | ||
36 | static void snd_hda_generate_beep(struct work_struct *work) | |
37 | { | |
38 | struct hda_beep *beep = | |
39 | container_of(work, struct hda_beep, beep_work); | |
40 | struct hda_codec *codec = beep->codec; | |
41 | ||
4d4e9bb3 TI |
42 | if (!beep->enabled) |
43 | return; | |
44 | ||
1cd2224c | 45 | /* generate tone */ |
411fe85c | 46 | snd_hda_codec_write(codec, beep->nid, 0, |
1cd2224c MR |
47 | AC_VERB_SET_BEEP_CONTROL, beep->tone); |
48 | } | |
49 | ||
fa797966 TI |
50 | /* (non-standard) Linear beep tone calculation for IDT/STAC codecs |
51 | * | |
52 | * The tone frequency of beep generator on IDT/STAC codecs is | |
53 | * defined from the 8bit tone parameter, in Hz, | |
54 | * freq = 48000 * (257 - tone) / 1024 | |
369693dc | 55 | * that is from 12kHz to 93.75Hz in steps of 46.875 Hz |
fa797966 TI |
56 | */ |
57 | static int beep_linear_tone(struct hda_beep *beep, int hz) | |
58 | { | |
369693dc PV |
59 | if (hz <= 0) |
60 | return 0; | |
fa797966 | 61 | hz *= 1000; /* fixed point */ |
369693dc PV |
62 | hz = hz - DIGBEEP_HZ_MIN |
63 | + DIGBEEP_HZ_STEP / 2; /* round to nearest step */ | |
fa797966 TI |
64 | if (hz < 0) |
65 | hz = 0; /* turn off PC beep*/ | |
66 | else if (hz >= (DIGBEEP_HZ_MAX - DIGBEEP_HZ_MIN)) | |
369693dc | 67 | hz = 1; /* max frequency */ |
fa797966 TI |
68 | else { |
69 | hz /= DIGBEEP_HZ_STEP; | |
369693dc | 70 | hz = 255 - hz; |
fa797966 TI |
71 | } |
72 | return hz; | |
73 | } | |
74 | ||
75 | /* HD-audio standard beep tone parameter calculation | |
76 | * | |
77 | * The tone frequency in Hz is calculated as | |
78 | * freq = 48000 / (tone * 4) | |
79 | * from 47Hz to 12kHz | |
80 | */ | |
81 | static int beep_standard_tone(struct hda_beep *beep, int hz) | |
82 | { | |
83 | if (hz <= 0) | |
84 | return 0; /* disabled */ | |
85 | hz = 12000 / hz; | |
86 | if (hz > 0xff) | |
87 | return 0xff; | |
88 | if (hz <= 0) | |
89 | return 1; | |
90 | return hz; | |
91 | } | |
92 | ||
1cd2224c MR |
93 | static int snd_hda_beep_event(struct input_dev *dev, unsigned int type, |
94 | unsigned int code, int hz) | |
95 | { | |
96 | struct hda_beep *beep = input_get_drvdata(dev); | |
97 | ||
98 | switch (code) { | |
99 | case SND_BELL: | |
100 | if (hz) | |
101 | hz = 1000; | |
102 | case SND_TONE: | |
fa797966 TI |
103 | if (beep->linear_tone) |
104 | beep->tone = beep_linear_tone(beep, hz); | |
105 | else | |
106 | beep->tone = beep_standard_tone(beep, hz); | |
1cd2224c MR |
107 | break; |
108 | default: | |
109 | return -1; | |
110 | } | |
1cd2224c MR |
111 | |
112 | /* schedule beep event */ | |
113 | schedule_work(&beep->beep_work); | |
114 | return 0; | |
115 | } | |
116 | ||
123c07ae JK |
117 | static void snd_hda_do_detach(struct hda_beep *beep) |
118 | { | |
119 | input_unregister_device(beep->dev); | |
120 | beep->dev = NULL; | |
121 | cancel_work_sync(&beep->beep_work); | |
122 | /* turn off beep for sure */ | |
411fe85c | 123 | snd_hda_codec_write(beep->codec, beep->nid, 0, |
123c07ae JK |
124 | AC_VERB_SET_BEEP_CONTROL, 0); |
125 | } | |
126 | ||
127 | static int snd_hda_do_attach(struct hda_beep *beep) | |
1cd2224c MR |
128 | { |
129 | struct input_dev *input_dev; | |
123c07ae | 130 | struct hda_codec *codec = beep->codec; |
1cd2224c MR |
131 | int err; |
132 | ||
1cd2224c | 133 | input_dev = input_allocate_device(); |
6a12afb5 | 134 | if (!input_dev) { |
123c07ae | 135 | printk(KERN_INFO "hda_beep: unable to allocate input device\n"); |
6a12afb5 TI |
136 | return -ENOMEM; |
137 | } | |
1cd2224c MR |
138 | |
139 | /* setup digital beep device */ | |
140 | input_dev->name = "HDA Digital PCBeep"; | |
141 | input_dev->phys = beep->phys; | |
142 | input_dev->id.bustype = BUS_PCI; | |
143 | ||
144 | input_dev->id.vendor = codec->vendor_id >> 16; | |
145 | input_dev->id.product = codec->vendor_id & 0xffff; | |
146 | input_dev->id.version = 0x01; | |
147 | ||
148 | input_dev->evbit[0] = BIT_MASK(EV_SND); | |
149 | input_dev->sndbit[0] = BIT_MASK(SND_BELL) | BIT_MASK(SND_TONE); | |
150 | input_dev->event = snd_hda_beep_event; | |
151 | input_dev->dev.parent = &codec->bus->pci->dev; | |
152 | input_set_drvdata(input_dev, beep); | |
153 | ||
154 | err = input_register_device(input_dev); | |
155 | if (err < 0) { | |
f6154d6d | 156 | input_free_device(input_dev); |
123c07ae | 157 | printk(KERN_INFO "hda_beep: unable to register input device\n"); |
1cd2224c MR |
158 | return err; |
159 | } | |
123c07ae JK |
160 | beep->dev = input_dev; |
161 | return 0; | |
162 | } | |
163 | ||
164 | static void snd_hda_do_register(struct work_struct *work) | |
165 | { | |
166 | struct hda_beep *beep = | |
167 | container_of(work, struct hda_beep, register_work); | |
123c07ae JK |
168 | |
169 | mutex_lock(&beep->mutex); | |
13dab080 JK |
170 | if (beep->enabled && !beep->dev) |
171 | snd_hda_do_attach(beep); | |
172 | mutex_unlock(&beep->mutex); | |
173 | } | |
174 | ||
175 | static void snd_hda_do_unregister(struct work_struct *work) | |
176 | { | |
177 | struct hda_beep *beep = | |
178 | container_of(work, struct hda_beep, unregister_work.work); | |
179 | ||
180 | mutex_lock(&beep->mutex); | |
181 | if (!beep->enabled && beep->dev) | |
182 | snd_hda_do_detach(beep); | |
123c07ae JK |
183 | mutex_unlock(&beep->mutex); |
184 | } | |
185 | ||
186 | int snd_hda_enable_beep_device(struct hda_codec *codec, int enable) | |
187 | { | |
188 | struct hda_beep *beep = codec->beep; | |
189 | enable = !!enable; | |
13dab080 JK |
190 | if (beep == NULL) |
191 | return 0; | |
192 | if (beep->enabled != enable) { | |
193 | beep->enabled = enable; | |
2dca0bba | 194 | if (!enable) { |
13dab080 | 195 | /* turn off beep */ |
411fe85c | 196 | snd_hda_codec_write(beep->codec, beep->nid, 0, |
13dab080 | 197 | AC_VERB_SET_BEEP_CONTROL, 0); |
2dca0bba JK |
198 | } |
199 | if (beep->mode == HDA_BEEP_MODE_SWREG) { | |
200 | if (enable) { | |
201 | cancel_delayed_work(&beep->unregister_work); | |
202 | schedule_work(&beep->register_work); | |
203 | } else { | |
204 | schedule_delayed_work(&beep->unregister_work, | |
205 | HZ); | |
206 | } | |
13dab080 | 207 | } |
123c07ae JK |
208 | return 1; |
209 | } | |
210 | return 0; | |
211 | } | |
212 | EXPORT_SYMBOL_HDA(snd_hda_enable_beep_device); | |
213 | ||
214 | int snd_hda_attach_beep_device(struct hda_codec *codec, int nid) | |
215 | { | |
216 | struct hda_beep *beep; | |
217 | ||
218 | if (!snd_hda_get_bool_hint(codec, "beep")) | |
9bb1fe39 TI |
219 | return 0; /* disabled explicitly by hints */ |
220 | if (codec->beep_mode == HDA_BEEP_MODE_OFF) | |
221 | return 0; /* disabled by module option */ | |
1cd2224c | 222 | |
123c07ae JK |
223 | beep = kzalloc(sizeof(*beep), GFP_KERNEL); |
224 | if (beep == NULL) | |
225 | return -ENOMEM; | |
226 | snprintf(beep->phys, sizeof(beep->phys), | |
227 | "card%d/codec#%d/beep0", codec->bus->card->number, codec->addr); | |
1cd2224c MR |
228 | /* enable linear scale */ |
229 | snd_hda_codec_write(codec, nid, 0, | |
230 | AC_VERB_SET_DIGI_CONVERT_2, 0x01); | |
231 | ||
232 | beep->nid = nid; | |
1cd2224c | 233 | beep->codec = codec; |
2dca0bba | 234 | beep->mode = codec->beep_mode; |
1cd2224c MR |
235 | codec->beep = beep; |
236 | ||
123c07ae | 237 | INIT_WORK(&beep->register_work, &snd_hda_do_register); |
13dab080 | 238 | INIT_DELAYED_WORK(&beep->unregister_work, &snd_hda_do_unregister); |
1cd2224c | 239 | INIT_WORK(&beep->beep_work, &snd_hda_generate_beep); |
123c07ae JK |
240 | mutex_init(&beep->mutex); |
241 | ||
2dca0bba | 242 | if (beep->mode == HDA_BEEP_MODE_ON) { |
54f7190b TI |
243 | int err = snd_hda_do_attach(beep); |
244 | if (err < 0) { | |
245 | kfree(beep); | |
246 | codec->beep = NULL; | |
247 | return err; | |
248 | } | |
2dca0bba JK |
249 | } |
250 | ||
1cd2224c MR |
251 | return 0; |
252 | } | |
ff7a3267 | 253 | EXPORT_SYMBOL_HDA(snd_hda_attach_beep_device); |
1cd2224c MR |
254 | |
255 | void snd_hda_detach_beep_device(struct hda_codec *codec) | |
256 | { | |
257 | struct hda_beep *beep = codec->beep; | |
258 | if (beep) { | |
123c07ae | 259 | cancel_work_sync(&beep->register_work); |
5f816697 | 260 | cancel_delayed_work(&beep->unregister_work); |
54f7190b | 261 | if (beep->dev) |
123c07ae | 262 | snd_hda_do_detach(beep); |
c44765b8 | 263 | codec->beep = NULL; |
123c07ae | 264 | kfree(beep); |
1cd2224c MR |
265 | } |
266 | } | |
ff7a3267 | 267 | EXPORT_SYMBOL_HDA(snd_hda_detach_beep_device); |